"use strict";

import defined from "terriajs-cesium/Source/Core/defined";
import defaultValue from "terriajs-cesium/Source/Core/defaultValue";

/**
 * Turns the longitude / latitude in degrees into a human readable pretty strings.
 *
 * @param {Number} longitude The longitude to format.
 * @param {Number} latitude The latitude to format.
 * @param {Object} options Object with the following properties:
 * @param {Number} options.height The height.
 * @param {Number} options.errorBar The error +/- for the height.
 * @param {Number} options.digits The number of digits to fix the lat / lon to.
 */
function prettifyCoordinates(longitude, latitude, options) {
  var result = {};

  const optionsDefaulted = defaultValue(options, {});
  const digits = defaultValue(optionsDefaulted.digits, 5);

  result.latitude =
    Math.abs(latitude).toFixed(digits) + "°" + (latitude < 0.0 ? "S" : "N");
  result.longitude =
    Math.abs(longitude).toFixed(digits) + "°" + (longitude < 0.0 ? "W" : "E");

  if (defined(optionsDefaulted.height)) {
    result.elevation =
      Math.round(optionsDefaulted.height) +
      (defined(optionsDefaulted.errorBar)
        ? "±" + Math.round(optionsDefaulted.errorBar)
        : "") +
      "m";
  } else {
    result.elevation = undefined;
  }

  return result;
}

module.exports = prettifyCoordinates;
